[Interpreter] Change LogicalNot to ToBooleanLogicalNot and add non-ToBoolean version.

test/unittests/interpreter/bytecode-peephole-optimizer-unittest.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/factory.h"
 #include "src/interpreter/bytecode-peephole-optimizer.h"
 #include "src/interpreter/constant-array-builder.h"
 #include "src/objects-inl.h"
@@ skipping 124 matching lines @@
   CHECK_EQ(write_count(), 0);
   optimizer()->Write(&second);
   CHECK_EQ(write_count(), 1);
   CHECK_EQ(last_written(), first);
   optimizer()->FlushBasicBlock();
   CHECK_EQ(write_count(), 2);
   CHECK_EQ(last_written().bytecode(), Bytecode::kJumpIfTrue);
   CHECK_EQ(last_written().operand(0), second.operand(0));
 }
 
+TEST_F(BytecodePeepholeOptimizerTest, KeepToBooleanLogicalNot) {
+  BytecodeNode first(Bytecode::kLdaNull);
+  BytecodeNode second(Bytecode::kToBooleanLogicalNot);
+  optimizer()->Write(&first);
+  CHECK_EQ(write_count(), 0);
+  optimizer()->Write(&second);
+  CHECK_EQ(write_count(), 1);
+  CHECK_EQ(last_written(), first);
+  optimizer()->FlushBasicBlock();
+  CHECK_EQ(write_count(), 2);
+  CHECK_EQ(last_written(), second);
+}
+
+TEST_F(BytecodePeepholeOptimizerTest, ElideToBooleanLogicalNot) {
+  BytecodeNode first(Bytecode::kLdaTrue);
+  BytecodeNode second(Bytecode::kToBooleanLogicalNot);
+  optimizer()->Write(&first);
+  CHECK_EQ(write_count(), 0);
+  optimizer()->Write(&second);
+  CHECK_EQ(write_count(), 1);
+  CHECK_EQ(last_written(), first);
+  optimizer()->FlushBasicBlock();
+  CHECK_EQ(write_count(), 2);
+  CHECK_EQ(last_written().bytecode(), Bytecode::kLogicalNot);
+}
+
 // Tests covering BytecodePeepholeOptimizer::CanElideCurrent().
 
 TEST_F(BytecodePeepholeOptimizerTest, LdarRxLdarRy) {
   BytecodeNode first(Bytecode::kLdar, Register(0).ToOperand(),
                      OperandScale::kSingle);
   BytecodeNode second(Bytecode::kLdar, Register(1).ToOperand(),
                       OperandScale::kSingle);
   optimizer()->Write(&first);
   optimizer()->FlushForOffset();  // Prevent CanElideLast removing |first|.
   CHECK_EQ(write_count(), 0);
@@ skipping 195 matching lines @@
   CHECK_EQ(write_count(), 0);
   optimizer()->FlushBasicBlock();
   CHECK_EQ(write_count(), 1);
   second.source_info().Update(first.source_info());
   CHECK_EQ(last_written(), second);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8